1. Clinic of Reproductive Medicine, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
2. Institute of Veterinary Anatomy, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland
3. Department of Histology and Embryology, Faculty of Veterinary Medicine, Erciyes University, Turkey
4. Section for Veterinary Reproduction and Obstetrics, Department of Veterinary Clinical Sciences, University of Copenhagen, Frederiksberg, Denmark
5. Reproductive Unit of the Clinics – Small Animal, University of Veterinary Medicine Hannover, Foundation, Hannover, Germany
6. Department of Small Animal Clinical Sciences, Virginia-Maryland College of Veterinary Medicine, Blacksburg, VA, USA